To reliably change the price format(group and decimal symbol) without having to override several classes or write plugins for them, I need to override the en.xml from the Zend library. Changing the XML directly covers several areas at once, like list view, product view or knockoutJS.
vendor/magento/zendframework1/library/Zend/Locale/Data/en.xml
I tried to override it via theme, but that didn't seem to work. Any ideas?